Control device for hybrid vehicle

Abstract

A control device for a hybrid vehicle includes: a drive control unit that calculates required drive power which is required for a hybrid vehicle based on an accelerator opening when an accelerator return operation is performed, calculates a target engine output which changes slowly with respect to a required engine output for realizing the required drive power through slow change processing, and controls an engine, a first rotary machine, and a second rotary machine such that an engine output reaches the target engine output; and a smoothing rate setting unit that changes a smoothing rate which is used for the slow change processing based on a supercharging pressure and sets the smoothing rate to a smaller value when the supercharging pressure is high than when the supercharging pressure is low.

What is claimed is: 
     
       1. A control device for a hybrid vehicle including an engine with a supercharger, a first rotary machine that is able to adjust a rotation speed of the engine, and a power storage device that transmits and receives electric power to and from the first rotary machine, the control device comprising:
 a drive control unit configured to calculate required drive power which is required for the hybrid vehicle based on an accelerator operation amount when an accelerator return operation is performed, to calculate a target engine output which changes slowly with respect to required engine output for realizing the required drive power through slow change processing, and to control the engine and the first rotary machine such that an engine output reaches the target engine output; and 
 a smoothing rate setting unit configured to change a smoothing rate which is used for the slow change processing based on a supercharging pressure in the engine and to set the smoothing rate to a smaller value when the supercharging pressure is high than when the supercharging pressure is low. 
 
     
     
       2. The control device for a hybrid vehicle according to  claim 1 , wherein the hybrid vehicle further includes a second rotary machine that transmits and receives electric power to and from the power storage device and is connected to a power transmission path between the engine and driving wheels in a power-transmittable manner, and
 wherein the second rotary machine consumes generated electric power of the first rotary machine when an accelerator depressing operation is performed and does not consume the generated electric power of the first rotary machine when the accelerator return operation is performed. 
 
     
     
       3. The control device for a hybrid vehicle according to  claim 1 , wherein the smoothing rate setting unit is configured to further set the smoothing rate to a smaller value when an accelerator return speed in the accelerator return operation is high than when the accelerator return speed is low based on the accelerator return speed in the accelerator return operation. 
     
     
       4. The control device for a hybrid vehicle according to  claim 1 , wherein the smoothing rate setting unit is configured to further set the smoothing rate to a smaller value when an accelerator operation amount after the accelerator return operation is small than when the accelerator operation amount is large based on the accelerator operation amount after the accelerator return operation.